#!/bin/sh

git__fetch() {
	if [ -n "$BASH_AUTOFETCH_TIMEOUT" ]; then
		timeout=$BASH_AUTOFETCH_TIMEOUT
	else
		timeout=60
	fi
	if [ -f "$1/.git/FETCH_HEAD" ]; then
		diff=$(($(date +%s) - $(stat -c %Y $1/.git/FETCH_HEAD)))
	else
		diff=9999
	fi
	if [ "$diff" -gt "$timeout" ]
	then run=1
	else run=0
	fi
	if [ "$run" -gt 0 ]; then
		touch $1/.git/FETCH_HEAD
		nohup git fetch > /dev/null 2>&1 &
	fi
	echo $run
}

git__prompt () {
	top=$(git rev-parse --show-toplevel 2>/dev/null)
	if [ -n "$top" ]
	then
		if [ "$BASH_AUTOFETCH" -gt 0 ]; then
			autofetch=$(git__fetch $top)
			f=$((2-$autofetch))
		else
			f=3
		fi
		status=$(git status --short 2>/dev/null)
		branch=$(git branch | grep -Po '(?<=\* )[[:alnum:]_.-]*')
		modif=$(echo "$status" | grep -Po '^\s*M' | wc -l)
		untracked=$(echo "$status" | grep -Po '^\?\?' | wc -l)
		added=$(echo "$status" | grep -Po '^\s*[A]' | wc -l)
		deleted=$(echo "$status" | grep -Po '^\s*[D]' | wc -l)
		renamed=$(echo "$status" | grep -Eo '^\s*R' | wc -l)
		stat=$(git branch -vv | grep -P '^\*' | grep -Po '\[.*\]')
		ahead=$(echo $stat | grep -Po '(?<=ahead )\d*')
		behind=$(echo $stat | grep -Po '(?<=behind )\d*')
		gray='\033[00;37m'
		blue='\033[01;34m'
		yellow='\033[01;33m'
		red='\033[01;31m'
		green='\033[01;32m'
		purple='\033[01;35m'

		/bin/echo -ne "\033[00;3${f}mδ\033[00;33m "
		/bin/echo -ne "${purple}$(basename $top) "

		# BRANCH
		if [ -z "$branch" ]
		then
			head=$(git rev-parse --short HEAD 2>&1)
			if [ "$(echo "$head" | grep '^fatal')" ]
			then
				branch='{no commits}'
			else
				branch='#'"$head"
			fi
		fi
		if [ "$branch" = 'master' ]
		then
			/bin/echo -ne "$blue"
		elif [ $(echo "$branch" | grep '^#' ) ]
		then
			/bin/echo -ne "$red"
		else
			/bin/echo -ne "$yellow"
		fi
    /bin/echo -ne "$branch\033[00;36m"

		# SYNC
		if [ -z "$ahead" ] && [ -z "$behind" ]
		then
			/bin/echo -ne "" # Nothing to do here
		elif [ -z "$ahead" ]
		then
			/bin/echo -ne " ${yellow}↓${behind}"
		elif [ -z "$behind" ]
		then
			/bin/echo -ne " ${green}↑${ahead}"
		else
			/bin/echo -ne " ${red}↓${behind}${red}↑${ahead}"
		fi

		# CHANGES
		if [ "$modif" = 0 ]
		then
			/bin/echo -ne # "${gray}:\033[01;36m$modif" # No modified files
		else
			/bin/echo -ne " \033[01;36m≠$modif" # Modified files
		fi
		if [ "$added" -ne 0 ]
		then
			/bin/echo -ne " ${purple}+$added"
		fi
		if [ "$deleted" -ne 0 ]
		then
			/bin/echo -ne " ${red}-$deleted"
		fi
		if [ "$renamed" -ne 0 ]
		then
			/bin/echo -ne " ${purple}~$renamed"
		fi
		if [ "$untracked" -ne 0 ]
		then
			/bin/echo -ne " ${yellow}+$untracked"
		fi
  else
    exit 1
	fi
}

git__prompt